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题目:Early computer networks used leased telephone company lines for their connections. Telephone company systems of that time established a single connection between ( ) and receiver for each telephone call, and that connection carried all ( ) along a single path. When a company wanted to connect computers it ( ) at two different locations, the company placed a telephone call to ( ) the connection, and then connected one computer to each end of that single connection. 1.establish 2.owned 3.sender 4.data
参考答案:
A、3214
B、1234
C、3421
D、4213
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